EP2643719A2 - Strukturierte doppelmantelfaser - Google Patents
Strukturierte doppelmantelfaserInfo
- Publication number
- EP2643719A2 EP2643719A2 EP11796915.4A EP11796915A EP2643719A2 EP 2643719 A2 EP2643719 A2 EP 2643719A2 EP 11796915 A EP11796915 A EP 11796915A EP 2643719 A2 EP2643719 A2 EP 2643719A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- fiber
- region
- core
- core region
- channels
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02319—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by core or core-cladding interface features
- G02B6/02338—Structured core, e.g. core contains more than one material, non-constant refractive index distribution in core, asymmetric or non-circular elements in core unit, multiple cores, insertions between core and clad
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02004—Optical fibres with cladding with or without a coating characterised by the core effective area or mode field radius
- G02B6/02009—Large effective area or mode field radius, e.g. to reduce nonlinear effects in single mode fibres
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02319—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by core or core-cladding interface features
- G02B6/02333—Core having higher refractive index than cladding, e.g. solid core, effective index guiding
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
- G02B6/0288—Multimode fibre, e.g. graded index core for compensating modal dispersion
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03622—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only
Definitions
- the invention relates to a double-mantle optical fiber having a core region and a cladding region, wherein the cladding region has an inner region and an outer region with a lower refractive index than the inner region and the core region, wherein the outer region surrounds the inner region.
- Double sheath fibers of this type are used in laser systems and in particular in fiber laser systems.
- the pumping light with low beam quality can be coupled into the cladding region and / or the core region of the fiber, while the signal light propagates with significantly higher beam quality, primarily within the core region.
- the quality of each fiber laser system depends largely on the fiber used.
- the introduction of double-jacket technology made it possible for the first time to exploit the high performance of pump diodes of low brilliance (beam quality).
- Commercially available CW laser systems now achieve output powers of 10 kW.
- CONFIRMATION COPY Properties and emit diffraction-limited radiation of high quality regardless of the output power.
- an increased core diameter provides the advantage that more active ions can be introduced, thereby increasing the energy stored in the fiber. In this way, the length of the necessary absorption path within the fiber can be reduced, which in turn results in a shorter fiber.
- the problem with this approach is that a larger core diameter at the same time causes a multitude of modes to propagate within the fiber core. This reduces the beam quality of the laser system. At the same time laser instabilities can occur, which significantly affect the operating characteristics of the laser. Therefore, as the core diameter increases, it is always necessary to ensure single mode operation within the fiber.
- LMA fibers can be realized as step index fibers, whereby the numerical aperture (NA) is technically limited to a value of approximately 0.06. This corresponds to a maximum single-mode core diameter of approximately 13 ⁇ m. LMA step index fibers with larger core diameters thus basically lead to several modes (multimode operation).
- a single-mode Operation can be achieved by targeted excitation of the fundamental mode of a multimode fiber. This approach is disclosed, for example, in document US 5,818,630 C1. The problem with this approach is that the signal light must be very carefully coupled into the fiber in order to excite only the fundamental mode. However, this is very expensive in practice and can only be fulfilled with difficulty at high powers.
- PCF photonic crystal fibers
- These fibers have an actively doped fiber core and a jacket of periodically arranged around this core air channels.
- Such a fiber design discloses WO 2006/082348 A9. If the air passages are narrow enough and extend at great radial distance from the fiber core, guidance based on the effective refractive index difference may be assumed.
- the advantage with these fibers is that the channel diameter d and the center distance ⁇ of two channels affect the numerical aperture of the fiber. This allows the numerical aperture to be reduced to very low values of approximately 0.01. In the prior art mode field diameter of over 50 ⁇ were achieved, which allow an effective single-mode operation.
- the photonic crystal fibers do not have a clear boundary between core and cladding, they always operate in multimode mode. This in turn results in the known problems of mode instabilities and power fluctuations at high output powers. Effectively, these fibers are thereby limited to a mode field diameter of about 80 pm.
- an inner structure of the inner region which effects a spatial overlap of higher-order modes with the core region which is less than the spatial overlap of a fundamental mode with the core region. This effect can be called delocalization of the modes.
- the basic mode is managed within the core area.
- the double cladding fiber according to the invention basically operates in multimode mode because it has a double-cladding structure and, in contrast to the leakage-channel fiber, does not cause any different propagation losses for different modes.
- the effective single-mode operation in an active laser system can be justified by two properties. Even during the coupling of the signal beam, the excitation of higher-order modes is made more difficult due to their delocalization. As a result, contrary to the prior art, no targeted coupling and adjustment for exciting only the fundamental mode is required.
- the reduced overlap of the higher order modes with the doped core region results in significantly lower gain over the fundamental mode carried in the core region.
- the delocalization of the higher order modes may be related not only to the axial fiber core but also to other regions of the fiber. These selected areas, which likewise may have a lower overlap with the higher-order modes, are also understood as the core area within the meaning of the invention.
- the structured double cladding fiber according to the invention typically supports several hundred modes.
- a double cladding fiber propagate basically all modes without significant losses, as in theoretical ideal case no mode coupling can take place. Because there is no closed boundary between core area and cladding area, the modes of both areas can not be clearly separated. As a result, the modes of the core region are also immediately modes of the entire fiber, but most of their energy is concentrated in the core region of the fiber.
- the fundamental mode within the structured double cladding fiber does not always have the highest effective refractive index. Also, the effective refractive indices of higher order Kemmoden can be mixed with the cladding modes.
- modes of the core region and “modes of the cladding region” must be defined based on the localization, since they primarily propagate within the core region or the cladding region. This intermixing of the effective indices of core and cladding modes can result in avoiding crossing between modes, thereby exploiting severe deformation or delocalization.
- the double cladding fiber may be at least partially, in particular in the core region, doped with rare earth ions. It can also be designed so that it is polarization-preserving or specifically changes the polarization. Doping with corresponding elements also allows index matching or mismatching of the fiber regions, which in turn can lead to increased delocalization. Furthermore, the fiber may be mechanically rigid or particularly flexible for special applications.
- the core region may be separated from the remaining regions of the fiber by a refractive index step.
- the core region may also be defined by an index gradient.
- the inner structure is formed by channels extending substantially in the fiber longitudinal direction.
- the described properties of the delocalization according to the invention can be dominant in hexagonal structures of the channels, if the distance between two channels preferably corresponds to more than 20 times the wavelength of the propagating light.
- the Ratio of the diameter d of the channels to the center distance ⁇ of adjacent channels is less than 0.5, preferably less than 0.3.
- the core region of the structured double cladding fiber is formed by the absence of at least one channel. This variant is particularly easy to manufacture manufacturing technology.
- This embodiment, in which the diameters of the channels are relatively small compared to the distance between the channels, has proven to be particularly advantageous in practice.
- the channels are arranged in groups, which include two or more channels.
- the pitch of adjacent channels of the same group is smaller than the pitch of two channels belonging to different groups.
- the spacing of the centers of two adjacent groups should also be greater than 20 times the wavelength of the light propagating in the fiber.
- the channels can be arranged hexagonally in the cross section of the fiber. This concerns both the arrangement of the overall structure of all channels and the arrangement of the channels within the smaller groups.
- a further embodiment provides that the channels extend spirally outward from the core region.
- the spiral geometry can also be transferred into a hexagonal structure by using different sized channels.
- Other variants are also conceivable, for example, shapes which each have only one symmetry class, contain only one axis of symmetry or do not contain any symmetry axis.
- the channels within the internal structure may be arranged in two or more radially consecutive arrangements.
- the radially outermost arrangement may consist of more adjacent channels than the arrangement which is closer to the core region of the fiber.
- the modes conducted in the core region of the fiber can be separated from the modes outside the core region or outside the internal structure.
- the inner structure is surrounded by a further area which can be used to enhance delocalization or shielding.
- an enhancement of the delocalization can be achieved by an unstructured region, which can lead to an interaction of modes by having the same or a higher refractive index than the remaining inner region.
- Shielding can be achieved for example by a lower refractive index of the additional area compared to the rest of the inner area.
- This advantageous effect arises from the fact that the region of higher refractive index, which has the internal structure (eg channels), acts as a barrier, which effectively divides the fiber into two regions with different refractive indices. This prevents interaction between the modes of different areas. In this way, it is possible to increase the diameter of the outer structure without the fundamental mode experiencing an interaction, for example by avoiding crossing, with other modes, which could lead to a reduced overlapping of the fundamental mode with the core area.
- This additional area of shielding or increased delocalization can also be caused by a specific choice of the channel structure, for example additional rings with particularly dense channels or increased channel size. In this way, the external structure may primarily cause the delocalization of the higher-order modes from the core region, or support the effect of the internal structure.
- Both the outer structure and the inner structure can be segmented in the circumferential direction, resulting in a structural interruption in the circumferential direction.
- the individual segments may have elements which protrude radially outwards or inwards from the corner regions of the ring segments. In this way, in particular, a fine adjustment for the delocalization of the higher order modes can be made.
- the structured double cladding fiber according to the invention is particularly suitable for use in fiber laser systems in which high-power laser light Intensity should be guided and strengthened. In this sense, should be included in the invention expressly the laser systems, which use a Doppelmantelmaschine invention.
- Figure 1 cross-sectional view of a first
- Figure 2 Representation of the fundamental mode and four different modes of higher order within the double cladding fiber according to Figure 1;
- Figure 3 Representations of the fundamental mode and four different modes of higher order within a double cladding fiber according to Figure 1 with an increased diameter of the outer region.
- Figure 4 a second embodiment with a spiral arrangement of channels
- Figure 5 representations of the basic mode
- Figure 6 a third embodiment with a
- FIG. 7 Representations of the fundamental mode and four different modes of higher order within the double cladding fiber according to FIG. 6.
- FIG. 1 shows a double-cladding fiber in cross-section with a core region 1 and an inner region 2.
- the inner region has an inner structure 4 and is delimited by an outer region 3.
- the inner structure 2 is formed by channels parallel to the fiber axis, which have a refractive index different from the refractive index of the core region 1.
- a double cladding fiber can in principle be regarded as a normal index fiber index, which has a very large core.
- the core of this equivalent step index fiber extends over the entire inner region 2 and the core region 1 and is surrounded by the outer region 3 as a cladding of the step index fiber.
- the local distribution of modes within such a large diameter unstructured step index fiber is nearly homogeneous, whereby each region of the fiber core is interspersed on average by an equal number of modes 5, 6.
- An inventive delocalization of modes 5, 6 does not take place in such a step index fiber.
- the fiber core when the fiber core is surrounded by an inner structure 4, it is possible to delocalize some modes 6 from the core region 1 and to concentrate other modes 5 (fundamental mode) within the core region 1.
- the hexagonal arrangement of the channels 4 within the double cladding fiber is designed so that the higher-order modes 6 are delocalized from the core region 1, while only the desired fundamental mode 5 remains within the core region 1. This results in a good overlap of the fundamental mode 5 with the core region 1 and at the same time reduces the overlap of the higher-order modes 6 with the core region 1. In the case of a passive fiber, this results in less pronounced excitability of the higher-order modes 6 within the core region 1.
- the double sheath fiber shows an effective single-mode behavior.
- the structured double cladding fiber has a hexagonal arrangement of air ducts 4, which have a center distance ⁇ which is less than 0.5 in relation to the channel diameter d.
- the outer region 3 of the cladding region of the fiber has a diameter of 150 ⁇ m.
- FIG. 2 shows different modes 5, 6 of the double sheath fiber according to FIG. 1, which have a different overlap with the core region 1.
- the core area 1 is shown as a dashed circle.
- the Gaussian fundamental mode 5 has the largest overlap with the core region 1, namely about 85%. As a result, most of the energy of the injected beam will propagate in this mode 5.
- the higher order modes 6 have an overlap with the core region 1, which in any case is less than 55%.
- the overlap of the higher order modes 6 in the double cladding fiber is much lower. In the step index fiber, the proportion of the higher order modes 6 within the core region 1 would not be significantly lower than the fundamental mode 5.
- the higher order modes 6 have a correspondingly small overlap with the active one Region of Core Area 1.
- the modes propagate within the fiber, they are subject to different amplification ratios, thereby having a correspondingly lower proportion of higher order modes 6 at the output of the fiber. Although the latter effect plays an important role in active fibers, it is not necessary to the invention. Since the reduced overlap of the higher order modes 6 with the core region 1 of the fiber is independent of any doping, the delocalization of the higher order modes 6 is directly from the time the pump light enters the fiber because the higher order modes 6 are not can be stimulated efficiently. FIG.
- FIG. 3 shows the representations of the fundamental mode 5 as well as four different higher-order modes 6 within a double cladding fiber with an increased diameter of the outer region 3.
- the arrangement of the channels 4 within the inner structure 2 is the same as in the arrangement according to FIG Diameter of the outer region 3 is increased and is for example 181 pm.
- the diameter of the outer region 3 is increased and is for example 181 pm.
- the effective refractive indices of two higher-order modes 6 are very close to one another. This leads to an interaction of the two modes 6 with high deformation, as shown in FIG.
- the overlap of the fundamental mode 5 with the core region 1 remains approximately unchanged at approximately 84%, while the overlap of the higher order modes 6 is now considerably less than less than 25% than in the first embodiment according to FIGS. 1 and 2.
- FIG. 4 shows a second embodiment with a spiral arrangement of the channels 4.
- the spiral arrangement Although the channels 4 has no axes of symmetry, but it has sufficient similarity to a symmetrical arrangement, so that the leadership of the localized fundamental mode 5 can be ensured.
- FIG. 6 shows the overlap of the fundamental mode 5 with the core region 1 in the order of 76%, while the overlap of the higher order modes 6 is less than 15%.
- a third embodiment variant according to FIG. 6 shows a double-cladding fiber with a shielding of the inner structure 2.
- the shielding has a deviating refractive index in a region 7 realized. If this refractive index is greater than the refractive index of the environment, it is possible to increase the diameter of the outer region 3 without the fundamental mode 5 undergoing avoiding-crossing with another mode. This is because the region 7 of higher refractive index, which has the channels 4, acts as a barrier dividing the fiber into two regions with different effective refractive indices.
- the propagating modes are also divided into two separate groups with different refractive indices, resulting in prevention of avoiding crossing between modes from different groups.
- the higher refractive index region 7 completely surrounds the inner structure 2 of channels 4. Therefore, in comparison with the arrangement according to FIG. 1, there is no influence on the shape of the modes or the overlap with the core area 1. This results in an overlap of the fundamental mode 5 with the core area 1 of approximately 85%, while the modes are higher Order 6 have an overlap of a maximum of 54%.
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Lasers (AREA)
- Multicomponent Fibers (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11796915.4A EP2643719A2 (de) | 2010-11-23 | 2011-11-22 | Strukturierte doppelmantelfaser |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10192190 | 2010-11-23 | ||
EP11796915.4A EP2643719A2 (de) | 2010-11-23 | 2011-11-22 | Strukturierte doppelmantelfaser |
PCT/EP2011/005880 WO2012069180A2 (de) | 2010-11-23 | 2011-11-22 | Strukturierte doppelmantelfaser |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2643719A2 true EP2643719A2 (de) | 2013-10-02 |
Family
ID=45349444
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11796915.4A Pending EP2643719A2 (de) | 2010-11-23 | 2011-11-22 | Strukturierte doppelmantelfaser |
Country Status (3)
Country | Link |
---|---|
US (1) | US9065245B2 (de) |
EP (1) | EP2643719A2 (de) |
WO (1) | WO2012069180A2 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9656038B2 (en) | 2011-03-15 | 2017-05-23 | Resmed Limited | Air delivery conduit |
DE102014014315A1 (de) | 2014-10-01 | 2016-04-07 | Friedrich-Schiller-Universität Jena | Lichtwellenleiter |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2585863A1 (de) * | 2010-06-25 | 2013-05-01 | NKT Photonics A/S | Einzelmodus-glasfaser mit grossem kernbereich |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5818630A (en) | 1997-06-25 | 1998-10-06 | Imra America, Inc. | Single-mode amplifiers and compressors based on multi-mode fibers |
US6334017B1 (en) | 1999-10-26 | 2001-12-25 | Corning Inc | Ring photonic crystal fibers |
JP2002214466A (ja) | 2001-01-23 | 2002-07-31 | Sumitomo Electric Ind Ltd | 光ファイバ |
FR2822243B1 (fr) | 2001-03-16 | 2003-06-20 | Cit Alcatel | Fibre optique photonique a double gaine |
EP1745316A1 (de) | 2004-05-12 | 2007-01-24 | Prysmian Cavi e Sistemi Energia S.r.l. | Mikrostrukturierte optische faser |
FR2881845B1 (fr) | 2005-02-04 | 2007-06-01 | Centre Nat Rech Scient | Fibre optique composite pour laser a confinement d'ondes de pompe et de laser, applications aux lasers |
US7787729B2 (en) | 2005-05-20 | 2010-08-31 | Imra America, Inc. | Single mode propagation in fibers and rods with large leakage channels |
US7171091B1 (en) | 2005-08-15 | 2007-01-30 | The United States Of America As Represented By The Secretary Of The Air Force | Tuned cladding fiber amplifier and laser |
US7142757B1 (en) * | 2005-09-20 | 2006-11-28 | The United States Of America As Represented By The Secretary Of The Air Force | Large flattened mode tuned cladding photonic crystal fiber laser and amplifier |
US8755658B2 (en) | 2007-02-15 | 2014-06-17 | Institut National D'optique | Archimedean-lattice microstructured optical fiber |
-
2011
- 2011-11-22 WO PCT/EP2011/005880 patent/WO2012069180A2/de active Application Filing
- 2011-11-22 EP EP11796915.4A patent/EP2643719A2/de active Pending
- 2011-11-22 US US13/988,771 patent/US9065245B2/en active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2585863A1 (de) * | 2010-06-25 | 2013-05-01 | NKT Photonics A/S | Einzelmodus-glasfaser mit grossem kernbereich |
Non-Patent Citations (1)
Title |
---|
See also references of WO2012069180A2 * |
Also Published As
Publication number | Publication date |
---|---|
US9065245B2 (en) | 2015-06-23 |
WO2012069180A2 (de) | 2012-05-31 |
WO2012069180A3 (de) | 2012-10-11 |
US20140010246A1 (en) | 2014-01-09 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE112005000197B4 (de) | Löchrige Fasern mit großem Kern | |
DE102006023976B4 (de) | Einzelmoden-Ausbreitung in optischen Fasern und zugehörige Systeme | |
DE60038141T2 (de) | Optische Faser | |
DE19861484B4 (de) | Auf Multimodefasern basierende Einzelmodenverstärker | |
DE69524555T2 (de) | Durch die Umhüllung gepumpter MOPA-Laser | |
DE102011075213B4 (de) | Laserbearbeitungssystem mit einem in seiner Brillanz einstellbaren Bearbeitungslaserstrahl | |
DE69506689T2 (de) | Laser | |
DE10296886T5 (de) | Mantelgepumpter Faserlaser | |
DE102013208830A1 (de) | Hauptoszillator - leistungsverstärkersysteme | |
EP2406674B1 (de) | Einzelmodenpropagation in mikrostrukturierten optischen fasern | |
EP2478400B1 (de) | Transversalmodenfilter für wellenleiter | |
EP3201999B1 (de) | Lichtwellenleiter | |
DE112017004440T5 (de) | Optische Verbindungsstruktur und optisches Modul | |
EP2643719A2 (de) | Strukturierte doppelmantelfaser | |
EP2664220B1 (de) | Optischer resonator mit direktem geometrischem zugang auf der optischen achse | |
DE602004000047T2 (de) | Verstärkende optische Faser mit ringförmiger Anordung der Dotierung und Verstärker mit einer derartigen Faser | |
DE1797403B1 (de) | Vorrichtung zum fokussieren eines strahls | |
DE19620159C2 (de) | Faserlaser oder Faserverstärker mit neuartiger Brechzahlstruktur | |
EP2592704B1 (de) | Laservorrichtung mit einem optisch aktiven Material aufweisenden Multimode-Lichtleiter | |
DE102019114974A1 (de) | Lichtwellenleiter | |
EP2761344B1 (de) | Modenfilter mit brechzahlmodifikation | |
WO2022084100A1 (de) | Gepulster oder kontinuierlicher faserlaser oder -verstärker mit speziell dotierter aktiver faser | |
DE112005003885B3 (de) | Löchrige Fasern mit großem Kern, Faserverstärker oder Faserlaser | |
DE102023102052A1 (de) | Mehrkern-Lichtwellenleiter mit Polarisationserhaltung | |
DE102012012982A1 (de) | Laseranordnung mit Faserverstärker |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20130624 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: TUENNERMANN, ANDREAS Inventor name: JAUREGUI MISAS, CESAR Inventor name: LIMPERT, JENS Inventor name: JANSEN, FLORIAN Inventor name: STUTZKI, FABIAN |
|
DAX | Request for extension of the european patent (deleted) | ||
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: FRIEDRICH-SCHILLER-UNIVERSITAET JENA Owner name: FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWAN |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: TUENNERMANN, ANDREAS Inventor name: LIMPERT, JENS Inventor name: JAUREGUI MISAS, CESAR Inventor name: JANSEN, FLORIAN Inventor name: STUTZKI, FABIAN |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
17Q | First examination report despatched |
Effective date: 20180716 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: STUTZKI, FABIAN Inventor name: LIMPERT, JENS Inventor name: JAUREGUI MISAS, CESAR Inventor name: TUENNERMANN, ANDREAS Inventor name: JANSEN, FLORIAN |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: FRIEDRICH-SCHILLER-UNIVERSITAET JENA Owner name: FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V. |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: TUENNERMANN, ANDREAS Inventor name: JANSEN, FLORIAN Inventor name: LIMPERT, JENS Inventor name: STUTZKI, FABIAN Inventor name: JAUREGUI MISAS, CESAR |